Pile wire and method of making the same



Feb; 1930.

C. SCHLEMPER I FILE- WIRE AND IETHOD 0F IAKING THE SAIE Filed March 4, 1927 In V672 01".- Car 1 50/27 Zem ver with the motion of the blade.

Patented Feb. 25, 1930 I UNITED STATES CARL scHLE VrrER, or oH IGs GERM A'NY;

PILE WIRE'AND-METHOD or ivrAKInG THEISA IVIE'Q Application filed March 4, 1927, serial no. i72,741,' andin Gem-any March a. 11926. I Y

My invention relates to a method of, and means for, securing a cutter blade in a holder of channel-section, and it is an. object of my invention to provide a method and means for 'I thispurpose by which the, bladeis securely held against turning out of the channel.

into a recess in the channel holder so that the I parts are positively connected, and, in order to remove the blade, I flattenout' the forged down portion so that it will not interfere In a preferred embodiment of my inven tion and which is particularly adaptable for V E J securing blades in weavers rulers or needles,

in which an exchangeable blade is clamped bejtween the flanges of a channel-section, the

v i blade is heat-treated so that its metal partly remains unhardened and this soft: spot is forgedv into a recess in one of. the section 1 flanges.

',-In this manner the bladeis held against turning'out in. a very simple andeffioient manner. The forging operationmay be per- 5 formed as desired,'b ut preferably I employ apair ofpincers havlng two jaws one of which is provided with a punch and the other is normal. When it is desired to secure a blade ina holder, registering-holes are made 7 in its flanges,the blade is soinserted inthe holder that its soft spot coincides with the fltwo holes, and the punch of the pincers is I forced into one of the holes, bendingthe 'metal of the blade at the soft spota'nd forging it into the hole on the opposite side. :If it is desired to remove the bladethe pincers may be reversed so that the metal which'has I entered the'hole is forced out of it and'the blade may be withdrawn. Preferably, .how-

; 9 ever, I employ a separate instrumentfor removing the blade with a flat punch on one of its jaws, and a projection for keeping the jaws apart for a certain distance. The; fiat part is insertedin the holev into which the. soft spot of the blade haspreviously been forged so'that the metal is forced out ofthis hole, and the projection prevents thepunch from entering too far and forging the bent metal into the oppositeholei I 5 In the drawings affixed tothis' specification 'n the drawings; To this end I forge a portion' ofth i'bl d r the end'of a weavers ruler-0r needle,*-

and forming thereof, holder with example. r r

Fig. 1- is an elevation' ofa blade 'liolder2 'at 2 is an elevation'of. a Pair-10f *p'i for securingthe bladeimits'holderyand 1 260 Fig. 3 is a similar "elevation of a pair of pincers for removing the blade from "its- Theblade and the holder in Figs. 2and 3 are shown in section on the line AB in 5 I Fig.1. 7.

"Referring, now to the drawings, a is the shank of a weavers ruler or needle to the end of which aholder b of channel-section is se- 1 cured. At the outer endc of the holder, its W0. V "I: flanges are connected,preferablyby spotwelding. d is a blade which inserted in the holderso that its pointed inner end is located against a bevelled facee at the inner end of the holder and that its 'softspot is L 7 7' registering with two co-axialholesin the flanges of the channel one of which'is ini dicated ath in Fig. 1. V l A pair of pincers'for securingthe blade in theholder by forging its soft spot'into-one T689 if of the holes, is indicated at f in Fig. 2 and it I will appear that one jaw ofthe pincers is provided with a punch g, which is preferably rounded on its operating face so that when j V the pincers are applied it willi enter one of$8 the holes and forge the metal of the soft spot intothe oppositehole where it forms a boss 2' and the blade d is, securely held against being. turned out of the holder 6.

Referring now to Fig. 8, Z is a on one of the aws of the pincers k for remov- 7 ing the blade, and m is a projection on the.

same jaw which maintains .a given clearance between the jaws, and itwill appear that in this manner the punch Z is prevented from f entering too far into the hole h, and extrud- I ing the metal into the opposite hole. At the same time the projection m serves for pulling the blade out of its holder Z) when it has fim been released.

I Wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled 5 in the art.

I claim 1. The process of securing an exchangeable blade in a'pile Wire provided with a holder of channel section, and of removing V said blade from said holder, comprising hardening said blade except at one spot, providing opposite apertures. in the flanges of said channel section, bending the metal of said blade at said unhardened spot into one of said apertures for securing said blade in said holder and bending it out of said aperture preparatorily to removing said blade froinsaid holder. o

2. A pile Wire comprising a holder of channel section, each flange of said section having an aperture, and a hardened blade having a soft spot Which is bent into one of said apertures so as to secure said blade in said holder.

In testimony whereof I aflix my signature.

G ARL SCHLEMB-ER. 

